Machine cooling system for original machine

ABSTRACT

An improved cooling system for an original machine comprised of a temperature controller, a linear temperature sensor, a cooling liquid tank provided with a heat exchanger and a refrigeration frequency variable compressor; hot liquid of the original machine being detected by the sensor with data transmitted to the temperature controller for comparison with the preset temperature to control the refrigeration output of the compressor for the tank temperature to reflect as required by the original machine without causing excessive fluctuation of temperature difference, thus to achieve zero error in the positioning of the main shaft of the original machine in process.

BACKGROUND OF THE INVENTION

[0001] (a) Field of the Invention

[0002] The present invention is related to an improved cooling system for an original machine, and more particularly to one that maintains the main shaft in the original machine at a preset temperature to achieve zero error in positioning of the main shaft in process.

[0003] (b) Description of the Prior Art

[0004] A cooling system for original machine usually has a stationary cooling compressor to serve as the cooling source and on/off of the compressor is entirely controlled by a temperature switch operating at a constant setting so that the cooling compressor is immediately started for the operation at full speed once the temperature has reached that constant temperature. However, said design completely ignores the substantial temperature of the cooling liquid in the tank. Anyone with the basic knowledge about the cooling system of original machine knows that as the quantity is concerned, the cooling liquid in the tank is far greater than that in the original machine and in the loop. Accordingly, once the sensor detects excessive temperature reading, the compressor is immediately started while the massive amount of cooling liquid in the tank is not sufficient yet for the original machine to attain the constant temperature, resulting in that the temperature of the original machine remains higher than the preset temperature. On the other hand, when the operation of the compressor at full speed reaches the preset cooling temperature, the over-cooled liquid in the tank will continue to bring down the temperature of the original machine to cause temperature deflection.

[0005] Therefore, the traditional cooling compressor of the original machine suffers a very significant temperature fluctuation in the cycle from start-up to shut-off, resulting in positioning error of the original machine at work and further the failure in the production of a precision work piece. Meanwhile, drastic cooling will cause condensation to the main shaft to develop water drops. When those water drops are permitted into the work piece will damage both of the original machine and the work piece, a nightmare for long time to the mechanical tool process industry.

SUMMARY OF THE INVENTION

[0006] The present invention is related to an improved cooling system for an original machine, and more particularly to one that maintains the main shaft in the original machine at a preset temperature to achieve zero error in positioning of the main shaft in process.

[0007] The primary purpose of the present invention is to provide a frequency variable cooling system for the original machine that is capable of eliminating those two major defectives found with the prior art, positioning error and condensation, thus to minimize the loss suffered by the mechanical processor and to produce precision mechanical tool.

[0008] The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.

[0009] Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010]FIG. 1 is block chart showing the process flow of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0011] The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.

[0012] Referring to FIG. 1, a linear temperature sensor (14) is provided either at an outlet (11) of hot liquid from a cooling chamber (1) containing a main shaft of an original machine, or at an inlet (13) of hot liquid to a cooling liquid tank (12). A temperature controller (15) picks up data of temperature setting transmitted from the linear temperature sensor (14) and compares it with a preset value to activate a compressor with a frequency variable value of different refrigeration capacity depending on the results of the comparison.

[0013] Coolant of the compressor flows into a heat exchanger (16) provided in the cooling liquid tank (12) to bring down the temperature of the cooling liquid inside the tank (12). The cooling liquid in the tank (12) flows from an outlet (16) of the cooling tank (12). A pressure pump is provided at where between the cooling liquid outlet (17) from the tank and a cooling liquid inlet (18) into the cooling chamber (10). The cooling liquid leaving the tank (12) is pressurized before entering into the cooling outlet (17) of the cooling chamber (10) to cool down the temperature of the main shaft of the original machine.

[0014] Should the original machine be at low workload, the temperature of the main shaft rises slowly; therefore, the difference between the temperature of the cooling liquid from the hot liquid outlet (11) of the cooling chamber (10) and that of the preset value is small, and the temperature controller (15) regulates the cooling liquid in the tank (12) to a low cooling capacity. Once the workload of the original machine increases, relatively, the difference between the temperature of the cooling liquid from the hot liquid outlet (11) of the cooling chamber (10) and that of the preset value, then the temperature controller (15) regulates the cooling liquid in the tank (12) with a higher cooling capacity without causing any drastic cooling to occur for the cooling liquid in the tank (12).

[0015] When the workload of the original machine decreases, the cooling demand steps down and the temperature controller (15) decreases the cooling capacity of the compressor (19) to maintain the temperature change of the entire cooling system to its minimum and that is equivalent to maintain the temperature of the main shaft of the original machine constant. The deflection of the process temperature at fixed point of the main shaft of the original machine practically approximate to zero so to prevent the main shaft from developing condensation to damage the original machine and a work piece.

[0016] Furthermore, the pipeline between the frequency variable compressor and the heat exchanger may be made longer to be separately adapted with a plurality of heat exchangers and the cooling liquid in the tank may be in the form of oil, water and chemical fluid to maintain the system at constant temperature.

[0017] The present invention by keeping the temperature fluctuation for a cooling system of an original machine to its minimum with frequency variable cooling in coping with changed temperature of a main shaft in the original machine is innovative, therefore, this application for a utility patent is duly filed accordingly.

[0018] It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.

[0019] While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention. 

I claim:
 1. An improved cooling system for an original machine comprised of a temperature controller, a linear temperature sensor, a cooling liquid tank provided with a heat exchanger, and a refrigeration frequency variable compressor characterized by that the temperature of the original machine detected by the linear temperature sensor being transmitted to the temperature controller to be compared with the preset value to control refrigeration capacity of the refrigeration frequency variable compressor depending on the results of the comparison for the temperature of the cooling liquid tank to faithfully reflect as demanded by the original machine; and the temperature of a main shaft in the original machine being maintained at a preset value without causing drastic fluctuation of temperature difference thus to achieve zero error of process positioning for the main shaft of the original machine. 